<template>
    <div class="wrapper">
			
			<!-- header部分 -->
			<header>
				<p>商家信息</p>
			</header>
			
			<!-- 商家logo部分 -->
			<div class="business-logo">
				<img :src="business.businessImg">
			</div>
			
			<!-- 商家信息部分 -->
			<div class="business-info">
				<h1>{{business.businessName}}</h1>
				<p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
				<p>{{business.businessExplain}}</p>
			</div>
			
			<!-- 食品列表部分 -->
			<ul class="food">
				<li v-for="(item,index) in foodArray" :key="item.foodId">
					<div class="food-left">
						<img :src="item.foodImg">
						<div class="food-left-info">
							<h3>{{item.foodName}}</h3>
							<p>{{item.foodExplain}}</p>
							<p>&#165;{{item.foodPrice}}</p>
						</div>
					</div>
					<div class="food-right">
						<div>
							<i class="fa fa-minus-circle" @click="minus(index)"></i>
						</div>
						<p v-show="item.quantity > 0"><span>{{item.quantity}}</span></p>
						<div>
							<i class="fa fa-plus-circle" @click="add(index)"></i>
						</div>
					</div>
				</li>
			</ul>
			
			<!-- 购物车部分 -->
			<div class="cart">
				<div class="cart-left">
					<div class="cart-left-icon">
						<i class="fa fa-shopping-cart"></i>
						<div class="cart-left-icon-quantity" v-show="allQuantity>0">{{allQuantity}}</div>
					</div>
					<div class="cart-left-info">
						<p>&#165;{{allMoney}}</p>
						<p>另需配送费{{business.deliveryPrice}}元</p>
					</div>
				</div>
				<div class="cart-right">
					<!-- 不够起送费 -->
					<!--
					<div class="cart-right-item">
						&#165;15起送
					</div>
					-->
					<!-- 达到起送费 -->
					<div class="cart-right-item" @click="toOrder(businessId)" v-if="this.allMoney>=this.business.starPrice && this.allMoney!=0">
					    去结算
					</div>
					<div class="cart-false-item" v-else>
					    &#165;{{business.starPrice}}起送
					</div>
				</div>
			</div>
		</div>	
</template>

<script>
export default {
    data(){
        return {
            businessId:this.$route.query.businessId,
            business:{},
			foodArray:[],
			user:{},
			cartArray:[],
			allQuantity:0,
			allMoney:0
        }
    },
    created(){
		//查看SessionStorage中有没用user
        this.user = this.$getSessionStorage('user');
        // 根据businessId查询商家的信息
        this.$axios.post('BusinessController/getBusinessById',this.$qs.stringify({
            businessId:this.businessId
        })).then(response=>{
			console.log(response.data);
            this.business = response.data;
        }).catch(error=>{
            console.log(error)
        });
        this.$axios.post('FoodController/foodListByBusinessId',this.$qs.stringify({
            businessId:this.businessId
        })).then(response=>{
			this.foodArray = response.data;
			//需要对foodArray遍历，每遍历一次就会获取到一个Food对象，然后给这个对象添加一个quantity数量并设置为初始值0
            for(let i = 0;i<this.foodArray.length;i++){
                this.foodArray[i].quantity = 0;
			}
			//如果已经登录，那么需要去查询购物车中是否已经选中了某个食品
			if(this.user!=null){
				this.listCart();
			}
        }).catch(error=>{
            console.log(error)
        })
	},
	methods:{
		listCart(){
			this.$axios.post('CartController/listCart',this.$qs.stringify({
				businessId:this.businessId,
				userId:this.user.userId
			})).then(response=>{
				console.log(response.data);
				this.cartArray=response.data;
				for(let i = 0;i<this.foodArray.length;i++){
					for(let j = 0;j<this.cartArray.length;j++){
						if(this.foodArray[i].foodId == this.cartArray[j].foodId){
							this.foodArray[i].quantity = this.cartArray[j].quantity;
							this.allQuantity += this.cartArray[j].quantity;
							this.allMoney += (this.cartArray[j].food.foodPrice * this.cartArray[j].quantity);
						}
					}
				}
				this.foodArray.sort();
			}).catch(error=>{
				console.log(error);
			})
		},
		add(index){
            //先要登录验证的
            if(this.user==null){
                this.$router.push({path:'/login'});
                return
            }
            //下一步需要写什么呢，我要将点击完加号后的数据保存到Cart购物车表中
            //如果某一个食品的数量为0那么就要调用一个函数完成insert的操作
            if(this.foodArray[index].quantity==0){
				this.allQuantity++;
				this.allMoney+=this.foodArray[index].foodPrice;
				//将这个食品添加到购物车中
                this.saveCart(index);
			} else {
				this.foodArray[index].quantity++;
				this.allQuantity++;
				this.allMoney+=this.foodArray[index].foodPrice;
				this.updateCart(index);
			}
        },
        minus(index){
			//先要登录验证的
            if(this.user==null){
                this.$router.push({path:'/login'});
                return
            }
            //如果某一个食品的数量=1,则归0并删除数据库,>1则-1
            if(this.foodArray[index].quantity>1){
				//将这个食品添加到购物车中
				this.foodArray[index].quantity--;
				this.allQuantity--;
				this.allMoney-=this.foodArray[index].foodPrice;
				this.updateCart(index);
			} else if (this.foodArray[index].quantity=1) {
				this.allQuantity--;
				this.allMoney-=this.foodArray[index].foodPrice;
				this.foodArray[index].quantity=0;
				this.deleteCart(index);
			}
        },
        saveCart(index){
			//向后台发送请求
			this.$axios.post('CartController/saveCart',this.$qs.stringify({
				businessId:this.businessId,
				userId:this.user.userId,
				foodId:this.foodArray[index].foodId
			})).then(response=>{
				if(response.data==1){
					//食品的数量就要更新为1
					this.foodArray[index].quantity=1;
					//一定要调用sort方法排序之后才能在页面中显示
					this.foodArray.sort();
				}
			}).catch(error=>{
				console.log(error);
			})
          
		},
		updateCart(index){
			//向后台发送请求
			this.$axios.post('CartController/updateCart',this.$qs.stringify({
				businessId:this.businessId,
				userId:this.user.userId,
				foodId:this.foodArray[index].foodId,
				quantity:this.foodArray[index].quantity
			})).then(response=>{
				this.foodArray.sort();
			}).catch(error=>{
				console.log(error);
			})
          
		},
		deleteCart(index){
			//向后台发送请求
			this.$axios.post('CartController/deleteCart',this.$qs.stringify({
				businessId:this.businessId,
				userId:this.user.userId,
				foodId:this.foodArray[index].foodId
			})).then(response=>{
					this.foodArray.sort();
			}).catch(error=>{
				console.log(error);
			})
		},
		toOrder(businessId){
				this.$router.push({
				path:'/order',
				query:{businessId:businessId}
			})
		}
    }
}
</script>

<style scoped>
    .wrapper{
	width: 100%;
	height: 100%;
}

/****************** header部分 ******************/
.wrapper header{
	width: 100%;
	height: 12vw;
	background-color: #0097FF;
	color: #fff;
	font-size: 4.8vw;
	
	position: fixed;
	left: 0;
	top: 0;
	z-index: 1000;
	
	display: flex;
	justify-content: center;
	align-items: center;
}

/****************** 商家logo部分 ******************/
.wrapper .business-logo{
	width: 100%;
	height: 35vw;
	/*使用上外边距避开header部分*/
	margin-top: 12vw;
	
	display: flex;
	justify-content: center;
	align-items: center;
}
.wrapper .business-logo img{
	width: 40vw;
	height: 30vw;
	border-radius: 5px;
}

/****************** 商家信息部分 ******************/
.wrapper .business-info{
	width: 100%;
	height: 20vw;
	
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
.wrapper .business-info h1{
	font-size: 5vw;
}
.wrapper .business-info p{
	font-size: 3vw;
	color: #666;
	margin-top: 1vw;
}

/****************** 食品列表部分 ******************/
.wrapper .food{
	width: 100%;
	/*使用下外边距避开footer部分*/
	margin-bottom: 14vw;
}
.wrapper .food li{
	width: 100%;
	box-sizing: border-box;
	padding: 2.5vw;
	user-select: none;
	
	display: flex;
	justify-content: space-between;
	align-items: center;
}
.wrapper .food li .food-left{
	display: flex;
	align-items: center;
}
.wrapper .food li .food-left img{
	width: 20vw;
	height: 20vw;
}
.wrapper .food li .food-left .food-left-info{
	margin-left: 3vw;
}
.wrapper .food li .food-left .food-left-info h3{
	font-size: 3.8vw;
	color: #555;
}
.wrapper .food li .food-left .food-left-info p{
	font-size: 3vw;
	color: #888;
	margin-top: 2vw;
}
.wrapper .food li .food-right{
	width: 16vw;
	display: flex;
	justify-content: space-between;
	align-items: center;
}
.wrapper .food li .food-right .fa-minus-circle{
	font-size: 5.5vw;
	color: #999;
	cursor: pointer;
}
.wrapper .food li .food-right p{
	font-size: 3.6vw;
	color: #333;
}
.wrapper .food li .food-right .fa-plus-circle{
	font-size: 5.5vw;
	color: #0097EF;
	cursor: pointer;
}

/****************** 购物车部分 ******************/
.wrapper .cart{
	width: 100%;
	height: 14vw;
	
	position: fixed;
	left: 0;
	bottom: 0;
	
	display: flex;
}
.wrapper .cart .cart-left{
	flex: 2;
	background-color: #505051;
	display: flex;
}
.wrapper .cart .cart-left .cart-left-icon{
	width: 16vw;
	height: 16vw;
	box-sizing: border-box;
	border: solid 1.6vw #444;
	border-radius: 8vw;
	background-color: #3190E8;
	font-size: 7vw;
	color: #fff;
	
	display: flex;
	justify-content: center;
	align-items: center;
	
	margin-top: -4vw;
	margin-left: 3vw;
	
	position: relative;
}
.wrapper .cart .cart-left .cart-left-icon-quantity{
	width: 5vw;
	height: 5vw;
	border-radius: 2.5vw;
	background-color: red;
	color: #fff;
	font-size: 3.6vw;
	
	display: flex;
	justify-content: center;
	align-items: center;
	
	position: absolute;
	right: -1.5vw;
	top: -1.5vw;
}
.wrapper .cart .cart-left .cart-left-info p:first-child{
	font-size: 4.5vw;
	color: #fff;
	margin-top: 1vw;
}
.wrapper .cart .cart-left .cart-left-info p:last-child{
	font-size: 2.8vw;
	color: #AAA;
}

.wrapper .cart .cart-right{
	flex: 1;
}
/*达到起送费时的样式*/
.wrapper .cart .cart-right .cart-right-item{
	width: 100%;
	height: 100%;
	background-color: #38CA73;
	color: #fff;
	font-size: 4.5vw;
	font-weight: 700;
	user-select: none;
	cursor: pointer;
	
	display: flex;
	justify-content: center;
	align-items: center;
}

/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/

.wrapper .cart .cart-right .cart-false-item{
	width: 100%;
	height: 100%;
	background-color: #aaaaaa;
	color: #fff;
	font-size: 4.5vw;
	font-weight: 700;
	user-select: none;
	
	display: flex;
	justify-content: center;
	align-items: center;
}

</style>